dubbo 原始碼解析 2 5 3版本

1.  channeleventrunnable類

通道訊息執行緒

所有的訊息都在此處理，包含訊息的收，發，斷開連線，異常等

public class channeleventrunnable implements runnable 

public channeleventrunnable(channel channel, channelhandler handler, channelstate state, object message) 
public channeleventrunnable(channel channel, channelhandler handler, channelstate state, throwable t) 
public channeleventrunnable(channel channel, channelhandler handler, channelstate state, object message, throwable exception) 
public void run() catch (exception e) 
break;
case disconnected:
trycatch (exception e) 
break;
case sent:
trycatch (exception e) 
break;
case received:
trycatch (exception e) 
break;
case caught:
trycatch (exception e) 
break;
default:
logger.warn("unknown state: " + state + ", message is " + message);}}
}

public class defaultfuture implements responsefuture

通過每個channel[有channle id]發訊息後，然後用defaultfuture來接收返回的結果（同步返回乙個空結果）。具體的結果等到需要用時，直接調defaultfuture的get()方法，可以同步獲取呼叫結果

public object get() throws remotingexception 

// 獲取真正的呼叫結果
public object get(int timeout) throws remotingexception 
if (! isdone()) 
}} catch (interruptedexception e) finally 
if (! isdone()) 
}return returnfromresponse();
}

public class headerexchangehandler implements channelhandlerdelegate 

this.handler = handler;
}void handlerevent(channel channel, request req) throws remotingexception 
}// response handlerequest(exchangechannel channel, request req) throws remotingexception 
// find handler by message class.
object msg = req.getdata();
try catch (throwable e) 
return res;
}static void handleresponse(channel channel, response response) throws remotingexception 
}public void connected(channel channel) throws remotingexception finally 
}public void disconnected(channel channel) throws remotingexception finally 
}public void sent(channel channel, object message) throws remotingexception finally 
} catch (throwable t) 
if (message instanceof request) 
if (exception != null) else if (exception instanceof remotingexception) else }}
private static boolean isclientside(channel channel) 
public void received(channel channel, object message) throws remotingexception else else 
}} else if (message instanceof response) else if (message instanceof string) else 
}} else 
} finally 
}public void caught(channel channel, throwable exception) throws remotingexception }}
exchangechannel exchangechannel = headerexchangechannel.getoraddchannel(channel);
try finally 
}public channelhandler gethandler() else 
}}

（1） 傳送dubbo請求訊息

// 傳送訊息

public void sent(channel channel, object message) throws remotingexception finally 
} catch (throwable t) 
if (message instanceof request) 
if (exception != null) else if (exception instanceof remotingexception) else 
}}

// 接收訊息   

public void received(channel channel, object message) throws remotingexception else else 
}} else if (message instanceof response) else if (message instanceof string) else 
}} else 
} finally 
}

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